Glue film manufacturing process for electrode rim

Abstract

The invention belongs to a preparing method of an adhesive film for edges of electrodes, which is characterized by comprising the following preparing processes: 1) preparing adhesive: pouring anhydrous ethyl alcohol into a container, adding PVB while agitating and then uniformly agitating, sealing and laying the container up over 12 hours, thereby forming liquid cement, 2) dipping the liquid cement: taking the liquid cement to dilute with anhydrous ethyl alcohol, then dipping and coating the mixed liquid cement onto the edge of an electrode plate, 3) scraping edges: utilizing a stainless steel sheet to flatten the four flanges of the electrode plate, and the edges of the electrode plate are dipped with the liquid cement, thereby forming an adhesive film layer at the edges of the electrode plate after drying. By dipping and coating the liquid cement with fine permeability and adhesiveness on the edges of the electrode, active substance particles can be caught, thereby forming an adhesive film, which is not only simple in structure but can effectively prevent battery short circuit caused by powder-off and burr on the edges of the electrode. Further, because the adhesive film is extremely thin, the thickness and volume of the edges of the electrode can not be increased, and influence on ion breakthrough are avoided, thereby preventing damages to battery performances and increasing battery properties.

Description

technical field [0001] The invention belongs to the technical field of alkaline secondary battery assembly, and in particular relates to a method for preparing an electrode edge adhesive film. Background technique [0002] At present, in the production process of single battery assembly, due to the short circuit of the battery caused by the powder removal or edge burr on the edge of the electrode, the method of sticking the plastic self-adhesive strip to the edge of the electrode is generally used; To ensure the operation strength of the adhesive strip, the adhesive strip should not be too thin, which will inevitably increase the electrode thickness, especially for large-diameter cylindrical batteries, the length of the electrode is longer; for large-capacity square batteries, there are more pole pieces, which not only increases the useless volume of the battery, It can also affect battery performance. Contents of the invention [0003] In order to solve the problems in t...

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of single battery assembly, due to the short circuit of the battery caused by the powder removal or edge burr on the edge of the electrode, the method of sticking the plastic self-adhesive strip to the edge of the electrode is generally used; To ensure the operation strength of the adhesive strip, the adhesive strip should not be too thin, which will inevitably increase the thickness of the electrode, especially for large-diameter cylindrical batteries, the length of the electrode is longer; for large-capacity square batteries, there are more pole pieces, which not only increases the useless volume of the battery, Also affects battery performance